February 8, 2012

The stand-up desk: Double tenons for the leg stretchers, using the FMT

With my left shoulder on the mend (keeping fingers crossed…), and not having to lift above shoulder height, I decided to use the Leigh FMT to make the joinery for the end stretchers. These will connect the front legs to the back legs on the stand-up desk. Later, I will use a medial stretcher to connect the end stretchers.

I normally make at least five legs for a large piece like this desk. As usual, I use this extra leg, and a “spare” stretcher, to fine tune my setup with the FMT. I suggest you do the same with all joinery, as it will save many headaches. All dimensions on the spares are identical to those of the actual work pieces.

The photo below shows the twin tenons allowed by the 2-inch thick stretcher, just as I finished machining them – the tenons are 3/8-inch thick, 1-1/2 inch wide, and 1-1/4 inch long:

stretcher-tenons-target-view

The tenons aligned on the mortises:

stretcher-double-tenons-2

And, finally, the first dry fit:

stretcher-double-tenons-3

The fit was a little snug; but that is not a problem, as I can tweak the fit in 0.001″ increments. Now I can move to making the joinery on the real legs and end stretchers. Late in the day, I decided to wait until morning to do the real thing.

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A new arrival: The Leigh F2 finger joint template for the D4 jig

The following is a dramatic re-enactment of a delivery event that took place at the door to our mud room:

box-from-leigh

I rushed to the shop, and opened the box to reveal the contents – the Leigh F2 finger joint template, perfect for a number of boxes I will build:

f2-finger-joint-template

The photo below shows the quality of the F2 finger joint template – high quality all around; the logo is machined on the top surface:

f2-logo

In the photo below is the Variable Guidebush System, which allows precise adjustment of the size of the finger joinery (1/8th turn adjusts the joint fit by 0.001″ – one thousand of an inch!):

f2-variable-guide-bush

Not shown in these photos is the DVD that arrived in the same box. I have been watching some of the videos – the DVD contains 95 minutes of Leigh joinery jigs.

I look forward to using this new template – soon, I hope! This template is used on the Leigh D4 dovetail jig; to use it, I will remove the dovetail template, and install this one. Problem: I don’t know if I can wait too long (a large project in the shop: the stand-up desk)…

The features for the F2 are impressive (from the Leigh web site):

Features:

  • Precision CNC machined aluminum alloy template
  • Precisely adjustable joint fit
  • 9 sizes of finger joints for the F2 (1/16″, 3/32″, 1/8″, 5/32″, 3/16″, 1/4″, 5/16″, 3/8″, 1/2″) and 6 sizes for the F1600 (1/16″, 1/8″, 3/16″, 1/4″, 3/8″, 1/2″)
  • 4 sizes of unique rounded finger joints
  • 4 sizes of square half-blind corners
  • 4 sizes of round/square through corner joints

Comes Standard with

  • Leigh 8-piece VGS variable guide bush system for the F2
  • Fully illustrated user guide
  • The F2 attaches directly to the D4R or any D-series 24″ Dovetail jig

I promise a full review of the F2 finger joint template at the earliest possible time. In the meantime, I will be playing with it as time permits <sigh…>

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The stand-up desk: Defining the split tenons

Even as I started the mortise & tenon (M&T) joinery work on the front apron for the stand-up desk, I had not yet decided how to split the long tenons in two. For the side aprons, and the apron on the back, I had done them on the band saw, with great results:

split-tenons-on-bandsaw

The following were the results – perfect fit, with some wiggle room to allow for wood movement:

split-tenons-on-bandsaw-2

This time I wanted to try the new Gyokucho Japanese saw I bought from Di Legno Woodshop Supply in the Marketplace, at the Woodworking in America conference two weeks ago. And so I did – and liked it very much, as it kept me from having to raise my left arm above my shoulder:

dividing-tenons

The kerf is a very thin 0.012″ (twelve thousands of an inch). I also used this saw to remove the waste on the outside corners:

sawing-edge-of-tenons

Chiseling the waste was easy enough, as I sharpened all the chisels just before heading to St Charles, Ill.

I will continue working on the tenons, to get piston fit into the mortises. In the meantime, I worked on an ancient rabbet plane this afternoon, sharpening the iron and flattening its sole. I will try it on the cheeks of these tenons, after some practice runs on scrap quarter sawn white oak.

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